Serum or Plasma Substance Concentration for Sympathomimetic Drugs (Screening)

Why This Test Is Done

Your healthcare provider may order this test if you’ve been exposed to stimulant drugs (such as amphetamines, cocaine, or other sympathomimetics) or if symptoms like rapid heartbeat, high blood pressure, or unusual energy levels are present. It can also be part of a broader drug screening, especially in settings like emergency rooms or substance abuse evaluations.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample (usually from a vein in your arm) or, less commonly, a urine sample. If you’re taking medications, let your provider know, as some may affect results.

What the Test Results Mean

Positive results indicate the presence of sympathomimetic substances in your system. These drugs can cause serious health risks, including heart strain or irregular rhythms. Your doctor will discuss next steps based on your symptoms and test findings.

Common Causes of Positive Results

Exposure to illegal drugs (e.g., cocaine, methamphetamine), prescription stimulants (e.g., Adderall, Ritalin), or over-the-counter medications containing stimulants (e.g., some cold remedies). Misuse or accidental ingestion can also trigger positive results.